Hot-water heating system.



No.. 821,991. PATENTEDMAY 29, 1906. J. G. DEMAREST. HUT WATER HEATINGSYSTEM.

APPLICATION FILED JULY7, 1904.

' y 5MM/@ UNITED STATES PENT OFFICE. y

JAMEs G. DEMAREST, on WEST. HoBoKEN, NEW JERSEY, AssiGNoE To CLARA A.BAKER, ojE NEW YoRK, N. Y.

HOT-WATER HEATING f SYSTEM.

lcatented May 29, 1906.

Application led July '7, 1994. Serial No. 215.600.

To a/ZZ whom t may concern,.-l Be it known that I, JAMEs G. DEMAREsT, acitizen of the United States, residing in West Hoboken, county ofHudson, and State of New Jersey, have invented certain new and usefulImprovements in Hot-Water Heating Systems, of which the following is afull, clear, and exact specification. f

My invention relates to hot-water heating systems, and particularly tothat character of apparatus such as is usually employed for heatingrailroad-cars and the like, wherein a heating-coil is provided inoperative contact with a coal fire or other source of heat andradiating-pipes eXtend from said coil throughout the car for carryingthe heated fluid to places remote from the heater proper. In suchsystems it has been usual to employ a steam-jacket around a portion ofthe pipes, obtaining steam from the locomotive, and thus the heatingfluid may be caused to circulate in the ipes without the necessity of acoal lire in t e stove or heater proper. In these systems,. however, ithas required a considerable time to produce a com lete circulation ofthe Huid after building e in the heater or turning on the steam, owingto the increasing amount of piping required to fit out the more modernand very long cars, and it is this slowness in getting them under Waythat my invention is designed to obviate.

In the accompanying drawings, illustrating one form of my invention, Ihave shown a diagrammatic arrangement of pipes, it being understood thatthe dispositlon thereof is shown conventionally only. v

In the drawings, l represents the heatercoil, which may be of anywell-known type.

vTo the lower end of this coil is connected by a suitable joint thereturn-,pipes 2 3 of the circuits A and B. To the upper ends of the coilby a similar divided connecltionare attached the riser-pipes 4 5,carrying steam-jackets or steam-heaters 6 and 7 of any well-known type,the sectional view of the jacket 6 showing the preferable form which isfully shown in United States Letters Patent No. 498,924, granted toWilliam C. Baker June 6, 1893, and which therefore need not be hereinmore particularly described. From the upper end of each steam-jacket isprovided the pipes 8 and 9, leading into the expansion-drums 10j and 11,and from said expansion-drums pipes 12 and 13 lead to theradiating-pipes of each separate circuit around the car and back to thebottom of the. heating-coil. It will thus be seen that in my system Ihave two complete circulating systems, while utilizing but oneheating-coil in the coal-burning heater, and by dividing the circuits inthis manner the heated fluid has but half of the distance to travel, andI have found that a given-sized coil will produce a complete circulationin each branch in less than one-third of the time it takes to force thefluid through the same length of pipe were it in one continuous-circuit.

When it is desired to operate the system by the steam-heaters alone, itis unnecessary to require the two circuits to pass through the coil, andI have, therefore, provided a shunt-pipe 14, which ,connects the returnof the system B to the lower end of the steamheater 7, and by closingvalves 15 and 16 and opening valve 17 the systems A and B are madesubstantially independent and y distinct, as shown in the drawings.v Itis possible, however, and insome instances it may be desirable, to soarrange the pipingthat systems A and B will not be entirely independent,but be connected in series lwhen valves 15 and16 are closed-that is,'thewatercirculated from the systemA will return tothe bottom of system B,where it is subjected to the action of the heater 7 and is forcedthrough the system B back to the bottom of y system A. The main steamservice-pipe 18 supplies steam to steamheaters 6 and 7 through branches19 and 20, having valves 21 and 22.

I have found that when operating the circulation in systems of thischaracter it is advantageous to relieve any pressure which may becreated at the ince tion of the operation; but care must be talen thatno water is allowed to escape. To obtain this result, I provide theair-vents or relief-pipes 23 and 24, connected to the safety-vents 25and26, so as to be above the possible water-line in the drum, and by keepmgthe valves 27 and 28 open until the circulation has been completed andthen closing them I have an ideal result.

It is obvious that many modifications and IOO What I claim, and desire,to secure by Letters Patent, is-

1. In a hotwater heating system, a,plural ity of independentwater-circulating circuits, each of said circuits including expansionmeans, a heating-coil included in one of said circuits, with meansforbringingaid coil into communication with the other circuit, and anindependent steam-heating attach'- ment in operative connection witheach of said circuits, whereby each of said circuits may be operatedindependently or they may all be heated by the said heating-coil,substantially as described.

2. In a hot-water heating system, two independent circulating-circuits,each of said circuits including an independent expansion vessel, aheating-coil included in one of said independent circuits with means forbringing said coil into communication with the other circuit, and aseparate steam-heater for operating each of said circuits, whereby eachcircuit may be operated independently or they may both be operated bysaidheating-coil, substantially as described.

3. In a hot-water heating system two in'- dependentcirculating-circuits, each of said circuits including an independentexpansion vessel, a heating-coil included in` one of said independentcircuits with means for bringing said coil into communication with theother circuit, and a separate steam-heater above the coil for operatingeach of said circuits whereby'each circuit may be operated inde#pendently or they may both be operated by said heating-coil,substantially asl described.

4. In a hot-water heating system, two independent circulating-circuits,each of -said `circuits including an independent expansion vessel, asingle heatingcoil included in one of said independent circuits withmeans for f bringing said coil into communication with the othercircuits, and a shunt-pipe insuch. other circuit around the coil, anindependent r steam-heater for operating each of said circuits, wherebyeach of said circuits may be operated independently or they may both beoperated by said coil, substantially as described.

5. In a hot-water heating system, two independent circulating-circuits,each of said Icircuits including an expansion vessel, a singleheating-coil included in one of saidindependent circuits with means forbringing said coil into communication with the other circuit, and ashunt-pipe in such other circuit around the coil, an independentsteam-heater located above the coil for operating each of said-circuits,whereby each of-said circuits'inay be operated independently or they mayboth be operated by the said coil, substantially as described.

6. In a hot-water heating system, a plurality of water-,circulatingcircuits, each of said circuits including expansion means, a single coilincluded in one of said circulating-circuits, and means for bringingsaid coil into communication with the other circuit, an independentsteam-heating attachment upon each of said circuits, whereby each ofthesaid circuits may be operated independently or they may both be operatedbyf the said coil, and an yair-vent connecting thehighest kpoints in thesystem, substantiallyas described.

7. In a hot-waterheating system,ftwo independent circulating-circuits,each of said circuits including an expansion vessel, a single coilincluded in one `of saidfindependent circuits, -and 'means for bringingsaid coil into communication with-the other circuit, an inde endentsteam-heater for operating each of said circuits whereby the saidcircuits may be operated independently of'the said-coil, or they-*mayboth be operated by the said coil, and an air-vent connecting with thehighest points in the system, substantially as described.

8. .In a hotwater heating system, two independentVcirculating-circuits,-each of said circuits -including an expansionvessel, a single coil included in one of said independent circuits, andmeans for bringing said coil into communication'withlthe other circuit,an independent steam-heater for operating each 'of said circuits locatedabovethe coil, whereby i the said circuits may beoperated-.independently of thesaidcoil, orlthey may both be op-y eratedby the said coil, and an air-vent-connecting with the highest points inthe system, substantially as described.

9. lIn a hot-waterheating system, two independent circulating-circuits,each of said circuits including an eXp ansion vessel, a single coilincluded in one of said independent circuits, and means for bringingsaidicoil into communicationwiththe other circuit, a shunt-pipe insuchother circuit around the coil, and an independent steam-heater foroperating each of saidcircuits, whereby the-said circuits may beoperated independently of the said coil, or they may both be operated bythe said coil, and lan air-vent connecting with the highest points inthe system, substantially as described.

10. In a hot-water heating system, two independent circulating-circuits,each-of said circuits including an expansion vessel, a single coilincluded in one of said independent circuits, and means for bringingsaid coil into communication with Athe other circuit, a

shunt-pipe included in --such other .circuit IOO around the coil, anindependent steam-heater In testimony whereof I have hereunto setlocated above the coil for operating each of my hand in the presence oftWo subscribing IOl said circuits whereby tlhe said circuits may beWitnesses.

operated independent y o the said coil or they may both be operated bythe said doil, JAMES G DEMAREST and an air-Vent connecting with thehighest Witnesses:

points in the system, substantially as de- ADOLPH F. DINsY,

scribed. CEAS. D. KING.

